Here is the full list of all 26 SUPERHOT achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Kill over 1987 Red Dudes in endless mode.
Unlock all endless levels.
Become part of the community.
Find all secrets.
Get RED ending in every level of SPEEDRUN challenge.
Complete SUBWAY level.
Launch every app in the system.
Beat all Challenges.
Get RED ending in every level of SPEEDRUNrt challenge.
Complete SERV level.
Kill 100 Red Dudes with a katana.
Complete the game.
Kill 100 Red Dudes with a rifle.
Cut bullet with a katana.
Kill 100 Red Dudes with a shotgun.
Score 100 headshots.
Upload a replay on killstagram.com
Get back to the system after being expelled.
Kill 3 Red Dudes with one shotgun shot.
Kill 100 Red Dudes using melee.
Kill an enemy by jumping on him.
Kill 2 Red Dudes with one katana throw.
Kill 3 Red Dudes with one rifle burst.
Kill 100 Red Dudes with a pistol.
Shoot down a bullet with a bullet.